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logd: Find log time for arbitrary time to tail

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- prototype to evaluate the increase in complexity or
  performance impact.

Change-Id: I4e815d74c023092fbb75055d260f75de57ad6522
This commit is contained in:
Mark Salyzyn 2014-02-19 07:33:12 -08:00
parent fa3716b250
commit a1c60cf80d
1 changed files with 51 additions and 6 deletions
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57
logd/LogReader.cpp
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@ -92,14 +92,59 @@ bool LogReader::onDataAvailable(SocketClient *cli) {
}
// Convert realtime to monotonic time
if (start != log_time::EPOCH) {
log_time real(CLOCK_REALTIME);
log_time monotonic(CLOCK_MONOTONIC);
real -= monotonic; // I know this is not 100% accurate
start -= real;
}
if (start == log_time::EPOCH) {
start = LogTimeEntry::EPOCH;
} else {
class LogFindStart {
const pid_t mPid;
const unsigned mLogMask;
bool startTimeSet;
log_time &start;
log_time last;
public:
LogFindStart(unsigned logMask, pid_t pid, log_time &start)
: mPid(pid)
, mLogMask(logMask)
, startTimeSet(false)
, start(start)
, last(LogTimeEntry::EPOCH)
{ }
static bool callback(const LogBufferElement *element, void *obj) {
LogFindStart *me = reinterpret_cast<LogFindStart *>(obj);
if (!me->startTimeSet
&& (!me->mPid || (me->mPid == element->getPid()))
&& (me->mLogMask & (1 << element->getLogId()))) {
if (me->start == element->getRealTime()) {
me->start = element->getMonotonicTime();
me->startTimeSet = true;
} else {
if (me->start < element->getRealTime()) {
me->start = me->last;
me->startTimeSet = true;
}
me->last = element->getMonotonicTime();
}
}
return false;
}
bool found() { return startTimeSet; }
} logFindStart(logMask, pid, start);
logbuf().flushTo(cli, LogTimeEntry::EPOCH,
FlushCommand::hasReadLogs(cli),
logFindStart.callback, &logFindStart);
if (!logFindStart.found()) {
if (nonBlock) {
doSocketDelete(cli);
return false;
}
log_time now(CLOCK_MONOTONIC);
start = now;
}
}
FlushCommand command(*this, nonBlock, tail, logMask, pid, start);